Effect of functionalization on thermal conductivities of graphene/epoxy composites

Xi Shen, Zhenyu Wang, Ying Wu, Xiuyi Lin, Xu Liu, Xinying Sun, Jang Kyo Kim

Research output: Unpublished conference presentation (presented paper, abstract, poster)Conference presentation (not published in journal/proceeding/book)Academic researchpeer-review

Abstract

The effect of functionalization on thermal conductivities of graphene embedded in epoxy and its composites is studied using molecular dynamics simulations. The surrounding epoxy matrix reduces the thermal conductivity of graphene itself by 50 %, making it less efficient in improving the thermal conductivities of composites. The chemical modifications of graphene with different functional groups much reduce its intrinsic thermal conductivity, while they improve the interface thermal conductance between the functionalized graphene and epoxy. It is revealed that triethylenetetramine (TETA) functionalized graphene oxide (T-GO) is the most efficient in improving the thermal conductivities of composites among a few different graphene with and without functionalization. The covalent bonds and the ability of long chain of TETA to penetrate into the epoxy molecules facilitate the phonon coupling between T-GO and epoxy, which contribute to the enhanced interface thermal conductance and thus the thermal conductivities of the composites.

Original languageEnglish
Publication statusPublished - Jul 2015
Externally publishedYes
Event20th International Conference on Composite Materials, ICCM 2015 - Copenhagen, Denmark
Duration: 19 Jul 201524 Jul 2015

Conference

Conference20th International Conference on Composite Materials, ICCM 2015
Country/TerritoryDenmark
CityCopenhagen
Period19/07/1524/07/15

Keywords

  • Composites
  • Functionalization
  • Graphene
  • Molecular Dynamics
  • Thermal Conductivity

ASJC Scopus subject areas

  • Engineering(all)
  • Ceramics and Composites

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